Texas Instruments TMS320C67X/C67X+ DSP User Manual
Page 30
General-Purpose Register Files
CPU Data Paths and Control
2-4
SPRU733
Table 2−1. 40-Bit/64-Bit Register Pairs
Register Files
A
B
Devices
A1:A0
B1:B0
C67x DSP
A3:A2
B3:B2
A5:A4
B5:B4
A7:A6
B7:B6
A9:A8
B9:B8
A11:A10
B11:B10
A13:A12
B13:B12
A15:A14
B15:B14
A17:A16
B17:B16
C67x+ DSP only
A19:A18
B19:B18
A21:A20
B21:B20
A23:A22
B23:B22
A25:A24
B25:B24
A27:A26
B27:B26
A29:A28
B29:B28
A31:A30
B31:B30
Figure 2−2. Storage Scheme for 40-Bit Data in a Register Pair
ННННННННН
ННННННННН
31
0
31
0
Odd register
Even register
39
32
31
0
Zero-filled
40-bit data
39
32
31
0
40-bit data
Б
Б
Б
Б
Б
Б
Odd register
Even register
Read from registers
Write to registers
Ignored
7
8